There are nearly 30 million somalis. If we were to ever go extinct we'd need to all marry out and never marry another somali, and our kids must also do the same. Even with that it would take 2-3 generations or nearly 2 centuries for that to happen. It is literally impossible for an ethnicity to go extinct in 50 years until there is a MASS genocide like we've never seen before.
As for annexation? 100% won't happen anytime soon, definitely not in my or my kids' lifetime. Somalis have survived for centuries, maybe even millenias. We definitely won't be wiped out in half a century, that's ridiculous.